Think of a prop as you would a machine screw. Course thread holds well, but fine thread holds better, more surface area to grab onto. More surface area = better bite. The harder you turn, the more slip angle increases. This can be mitigated by trimming the motor down or getting the prop as deep as you can with a jack plate (i.e getting the prop into clean water). However, the nature of prop bite is linear, and as soon as you begin asking it to side load (i.e. turn), slip angle increases and the prop becomes less efficient. Adding another blade gives the prop 20% more surface area to "grab onto" and thus masks some of the inherent inefficiency of the turn.
The upshot is better hole shot and quicker onto plane along with more stern lift and likely the ability to stay on plane at lower RPMs and speeds (read greater midrange performance and economy). The theoretical trade-off is less top end due to drag, however, prop design has come a long way in the last 20 or 30 years and the actual compromise will likely be undetectable for you considering hull shape and power available and speeds likely to be achieved.
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